Are dry batteries environmentally friendly?


Are alkaline batteries more environmentally friendly? B […]

Are alkaline batteries more environmentally friendly? Because Lei Jun introduced the "alkaline environmental protection battery, mercury-free and cadmium-free" to the rainbow battery produced by Zimi.
Then let's come to the science of this question. The first thing to be clear is that batteries like Rainbow batteries and Nanfu batteries are actually dry batteries. Our batteries are a very common small object in my daily life, but there are indeed some elementary school questions.
What exactly is a dry battery?
In fact, a dry battery is a chemical battery that uses a paste-like electrolyte to generate direct current. Simply put, most of the batteries with solid chemical raw materials belong to the dry battery type.
Take the zinc-manganese dry battery that is common in daily life as an example, its structure is roughly as follows:
Cathode material: manganese (Mn), graphite rod
Anode material: zinc (Zn) sheet
Electrolyte: NH4Cl, ZnCl2 and starch paste
Those AA batteries sold in convenience stores that can only be used once are basically this kind of dry batteries. The reason why it can only be used once is because the chemical substances in it can no longer provide electricity after all the chemical effects, nor can it store externally provided electricity, so it cannot be used again after it is completely discharged. Such as: carbon-zinc battery, alkaline battery, mercury battery, lithium battery, etc. Those that can be recharged and reused can basically be called secondary batteries. The lithium-ion batteries in our mobile phones are secondary batteries.
There are dry batteries, are there still wet batteries? Simply put, it is a battery with liquid. The earliest invented "voltaic battery" is to put two metals in the same electrolyte as electrodes. For example, the lead-acid battery that is still in use, which is often said to belong to this kind of battery A "wet" battery has electrolyte in its battery shell.
Alkaline batteries are a magical horse, is it still acidic?
In fact, there are two common dry batteries in life, one is alkaline batteries and the other is carbon batteries. Alkaline batteries refer to batteries that use alkaline electrolyte. Alkaline batteries in our lives refer to alkaline zinc-manganese batteries. The full name of carbon battery is actually neutral zinc manganese dioxide dry battery, which belongs to the primary battery in chemical power supply.
In fact, what are the specific alkaline batteries and carbon batteries? In fact, you don’t need to care too much, as long as you know that the discharge time of an alkaline battery manufactured in accordance with national standards is 2-4 times that of a carbon battery, and the high-performance alkali The sex battery can be 1.5 times or even higher than the national standard.
Simply put, ordinary alkaline batteries are cheaper than carbon batteries, and they are more "sufficient" than carbon batteries. Those on the market that can be purchased for a few cents are usually carbon batteries.
No mercury or cadmium is more environmentally friendly?
The facts are indeed like this. In the early days, due to technical reasons, batteries contained heavy metals such as mercury and cadmium, which were mainly used as electrodes for batteries, and these heavy metals caused considerable environmental pollution, otherwise there would be no Such slogans "a battery can pollute the drinking water of a person's life", "a waste battery of No. 5 can make one square meter of land go to waste".
However, with the advancement of technology, most of the regular brands of alkaline dry batteries no longer contain heavy metals such as mercury and cadmium, and are relatively more environmentally friendly. They can be thrown directly into the trash can with other household waste.
In fact, in accordance with the "Regulations on Limiting the Mercury Content of Battery Products", the production of alkaline zinc-manganese batteries with a mercury content greater than 0.0001% of the battery weight was prohibited from January 1, 2005; the distribution of mercury content was prohibited from January 1, 2006 Alkaline zinc-manganese batteries that are greater than 0.0001% of the battery weight. "However, when discarding used batteries, you still have to pay attention to classification.
Attention, please pay attention to the fact that the author just talked about "most" and "regular" brands, so there will be "a few" and "informal" brands, so please keep your eyes open when buying batteries and don't accidentally buy "less" brands. Partially.
By the way, don’t throw away lead-acid batteries like those used in battery cars. They are harmful to the environment and need to be recycled.
Simply put, batteries that contain heavy metals need to be handled with care.